Authorities in Essex and Plymouth counties are investigating the unrelated deaths of two children, ages 2 and 4, just seven hours apart on Sunday, whose parents claim their children succumbed to unexplained circumstances — one while napping; the other while taking a bath.

The first tragedy occurred in Haverhill on Sunday afternoon.

A man called 911 to report he’d found his 2-year-old baby daughter unresponsive in her bed after putting her down for a nap.

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